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UMaterialInstance causes freeze on splash screen on Android, works on iOS

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Hi Epic Games,

I'm writing in to report a bug that was driving me crazy after I updated from UE 4.13.2 to UE 4.17.2. I consider this bug extra nasty because the exact same source code works without any assertions or crashes on Windows and iOS, but freezes on Android.

Inside the constructor of my game mode, I'm using

ConstructorHelpers::FClassFinder<AMeshActor> Type

to get a pointer to the class of a data only blueprint which the game mode will spawn later on. I'm initializing the TSubclassOf inside the constructor to set a default value which I can then override in the level editor.

When executing the FClassFinder, it will also execute the constructor of the base type from which the data only blueprint is derived. Inside that constructor, I use an